My Wife Cheating?

I am curious to know your opinion and thoughts on this... My wife used to work in a heavily dominated Male Industry and would travel and call on men (and women) in the Banking Business. We went thru a rough patch for a while where I was traveling - all of the time and she was traveling occasionally for customer and company meetings, etc... Many times she would take clients to dinner and or go to dinner with her boss, associates, etc... She just changed during this time and I thought for sure she was cheating or had a boyfriend. She would tell me when I returned from Travel that life around our home was much more pleasant when I was on the road, that everything was smoother and better for the kids and for her. No Stress. Apparently I stressed her out. She would travel and check in - typically early eve before a dinner or company meeting. It bothered me that she would never drink with me (go out for a fun night), have a glass of wine with me at home or enjoy the Hot Tub - when the teens were out, etc... We would just have Quickie Sex a few times a week - was the most I could get from here. She also told me - when I complained about our Sex life becoming quickies and frankly boring... that it was Not her job to take care of me! I asked... well whose job is it?!

Based on this do you think she was fooling around for that time? I would appreciate the thoughts and opinions of Mature Women - 40 to 50 Please. I don't want to accuse my wife of cheating - but things just were not the same and it is eating away at me.